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MediaWiki EUVDEUVD-2026-41039

| CVE-2026-58036 LOW
Information Exposure (CWE-200)
2026-07-01 wikimedia-foundation GHSA-qf2r-x8qv-xrwx
PHP Information Disclosure Mediawiki
2.1
CVSS 4.0 · Vendor: wikimedia-foundation

Severity by source

Vendor (wikimedia-foundation) PRIMARY
2.1 LOW
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
2.6 LOW

Network vector with high complexity and low privileges; user interaction required; only low confidentiality impact with no integrity or availability effect.

3.1 AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
4.0 AV:N/AC:H/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (wikimedia-foundation).

CVSS VectorVendor: wikimedia-foundation

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
P
Scope
X

Lifecycle Timeline

2
Patch available
Jul 01, 2026 - 17:01 EUVD
Analysis Generated
Jul 01, 2026 - 16:02 vuln.today

DescriptionCVE.org

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki.

This vulnerability is associated with program files includes/Api/ApiQueryAllUsers.Php, includes/Api/ApiQueryUsers.Php, includes/Permissions/PermissionManager.Php, includes/User/UserGroupManager.Php.

AnalysisAI

Insufficient permission enforcement in MediaWiki's user query API endpoints allows low-privileged authenticated users to access sensitive user information - such as group memberships or account details - that permission controls should restrict. The vulnerability spans four source files: ApiQueryAllUsers.php, ApiQueryUsers.php, PermissionManager.php, and UserGroupManager.php, indicating that the flaw lies in how permission checks are applied (or bypassed) when the API serializes user data. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with low-privileged MediaWiki account
Delivery
Identify API conditions satisfying AC:H complexity
Exploit
Craft query to ApiQueryAllUsers or ApiQueryUsers endpoint
Execution
Trigger passive user interaction (UI:P)
Persist
Permission gate in PermissionManager/UserGroupManager fails to filter response
Impact
Sensitive user attributes disclosed in API response
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid MediaWiki account with at least low-level privileges (PR:L); unauthenticated access is insufficient. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:H/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N) scores only 2.1, placing this squarely in the low severity band. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated MediaWiki user with minimal privileges (such as a standard registered account) crafts an API request to the allusers or users query endpoint under conditions where passive interaction from another user is involved. Because PermissionManager or UserGroupManager fails to correctly gate the response fields for the caller's privilege level, the API returns sensitive attributes - such as group memberships, hidden user details, or internal account flags - that the querying user should not be able to see. …
Remediation No vendor-released patched version has been independently confirmed from the available reference data. … Detailed patch versions, workarounds, and compensating controls in full report.
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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-41039 vulnerability details – vuln.today
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